STM8S208xx STMicroelectronics, STM8S208xx Datasheet - Page 5

• Manufacturer Part Number: STM8S208xx
• Description: (STM8S207xx / STM8S208xx) STM8S performance line revision X device limitations
• Manufacturer: STMicroelectronics

Errata sheet
2.4
UART PE flag cannot be cleared during reception of first half
of Stop bit
Description
When the UART is in reception mode and a parity error (PE) occurs, the PE flag is set by
hardware. This flag cannot be cleared during the first half of the Stop bit period. If software
tries to clear the PE flag at this time, the flag is set again by hardware, generating an
unwanted interrrupt if the PIEN bit is set in the UART_CR1 register.
Workaround
Disable PE interrupts and, after the RXNE bit is set, use polling to manage the PE flag. For
example, this could be done in the RXNE interrupt service routine.
Silicon limitations
www.DataSheet4U.com
5/8